First you must compress the file with a program like WinRAR or WinZIP, Also must put SFV/MD5 checksum to the file b4 you compress it.

Then you can upload it to a file server like FileFactory, MediaFire or RapidShare. There is also a web services like RapidSpread or Uploadjockey, Its A multiple sharing sites that upload files to 5 or more servers simultaneously, at the same time.